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...of any way to create an index of all the possible combinations of variables (factors) in a data frame? ie for 3 factors A, B & C we have A B C AB AC BC ABC which equates to columns 1, 2, 3, 1:2, (1,3), 2:3 and 1:3. I realise that a function like model.matrix does this, but how to get the seqence of the index? Any help would be greatly appreciated. Regards Alan Simpson Roberts Research Group [[alternative HTML version deleted]]

Hi, Look at the following code: Look at the following C code seqence: unsigned char mainGtU ( unsigned int i1, unsigned int i2, unsigned char* block) { unsigned char c1, c2; c1 = block[i1]; c2 = block[i2]; if (c1 != c2) return (c1 > c2); i1++; i2++; c1 = block[i1]; c2 = block[i2]; if (c1 != c2) return (c1 > c2...

Hello, I''m a total newbie, so please forgive my ignorance. I am trying to port an application from java to ruby. In order to do that, I need to put the object containing all the business logic into something like application scope. The nicest solution would be just to have an application wide hash, where I can put all kinds in of objects. Where and how would I instantiate such an

Hello, I am building an Rails applications that has to integrate an legacy system (lxoffice) (schema at: http://www.lx-office.org/uploads/media/DB_Schema_2.1.1_R_393_17_03_2005_.pdf). They somehow use global ids (global for some tables). I can not change the schema and still I want to use Rails to access it and not pure SQL. When I try to insert a record I get the following message:

I''m having (to me) a strange problem with errors when running my tests with rake as opposed to using ruby. If I do rake test:units I get this error for several tests, but not all: 13) Error: test_player_has_game_statistics_for_season(PlayerSeasonTest): ActiveRecord::StatementInvalid: Mysql::Error: Duplicate entry ''22'' for key 1: INSERT INTO positions (`name`, `id`,